<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <!-- 登录图标区开始 -->
        <img src="../assets/logo.png"
             alt="资源加载失败">
        <!-- 登录图标区结束 -->
      </div>
      <!-- 登录表单区域开始 -->
      <el-form ref="loginFormRef"
               :model="loginForm"
               label-width=""
               class="login_form"
               :rules="loginFormRules">
        <!-- 用户名区 -->
        <el-form-item label=""
                      prop="username">
          <el-input v-model="loginForm.username"
                    prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码区 -->
        <el-form-item label=""
                      prop="password">
          <el-input v-model="loginForm.password"
                    type="password"
                    prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <el-form-item label=""
                      class="btns">
          <el-button type="primary"
                     @click="login">登录</el-button>
          <el-button type="info"
                     @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
      <!-- 登录表单区域结束 -->
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 登录数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    // 登录
    login () {
      this.$refs.loginFormRef.validate(async (valid, b) => {
        if (!valid) return
        const { data: result } = await this.$http.post('login', this.loginForm)
        if (result.meta.status !== 200) return this.$message.error('用户名或密码错误')
        this.$message.success('登录成功')
        // 1.将登录成功之后的token保存到客户端的sessionStorage中
        // 1.1项目中除了登录之外的其他API接口都需要在登录之后才能访问
        // 1.2token只应当在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', result.data.token)
        // ?2.通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang='less' scoped>
// cnpm install less@3.9.0 less-loader@4.1.0 --save-dev   安装合适版本的less-loader和less
.login_container {
  color: red;
  background-color: aqua;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%); //设置login_box位移
}
//设置登录图标
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
